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/*
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* QEMU System Emulator
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*
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* Copyright (c) 2003-2008 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "sysemu.h" |
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#include "net.h" |
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#include "monitor.h" |
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#include "console.h" |
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#include "hw/hw.h" |
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#include <unistd.h> |
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#include <fcntl.h> |
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#include <time.h> |
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#include <errno.h> |
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#include <sys/time.h> |
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#include <signal.h> |
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#ifdef __FreeBSD__
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#include <sys/param.h> |
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#endif
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#ifdef _WIN32
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#include <windows.h> |
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#include <mmsystem.h> |
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#endif
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#include "qemu-timer.h" |
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/* Conversion factor from emulated instructions to virtual clock ticks. */
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int icount_time_shift;
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/* Arbitrarily pick 1MIPS as the minimum allowable speed. */
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#define MAX_ICOUNT_SHIFT 10 |
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/* Compensate for varying guest execution speed. */
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int64_t qemu_icount_bias; |
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static QEMUTimer *icount_rt_timer;
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static QEMUTimer *icount_vm_timer;
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/***********************************************************/
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/* guest cycle counter */
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typedef struct TimersState { |
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int64_t cpu_ticks_prev; |
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int64_t cpu_ticks_offset; |
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int64_t cpu_clock_offset; |
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int32_t cpu_ticks_enabled; |
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int64_t dummy; |
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} TimersState; |
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TimersState timers_state; |
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/* return the host CPU cycle counter and handle stop/restart */
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int64_t cpu_get_ticks(void)
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{ |
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if (use_icount) {
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return cpu_get_icount();
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} |
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if (!timers_state.cpu_ticks_enabled) {
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return timers_state.cpu_ticks_offset;
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} else {
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int64_t ticks; |
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ticks = cpu_get_real_ticks(); |
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if (timers_state.cpu_ticks_prev > ticks) {
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/* Note: non increasing ticks may happen if the host uses
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software suspend */
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timers_state.cpu_ticks_offset += timers_state.cpu_ticks_prev - ticks; |
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} |
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timers_state.cpu_ticks_prev = ticks; |
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return ticks + timers_state.cpu_ticks_offset;
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} |
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} |
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/* return the host CPU monotonic timer and handle stop/restart */
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static int64_t cpu_get_clock(void) |
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{ |
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int64_t ti; |
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if (!timers_state.cpu_ticks_enabled) {
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return timers_state.cpu_clock_offset;
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} else {
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ti = get_clock(); |
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return ti + timers_state.cpu_clock_offset;
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} |
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} |
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#ifndef CONFIG_IOTHREAD
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static int64_t qemu_icount_delta(void) |
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{ |
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if (!use_icount) {
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return 5000 * (int64_t) 1000000; |
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} else if (use_icount == 1) { |
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/* When not using an adaptive execution frequency
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we tend to get badly out of sync with real time,
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so just delay for a reasonable amount of time. */
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return 0; |
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} else {
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return cpu_get_icount() - cpu_get_clock();
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} |
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} |
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#endif
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/* enable cpu_get_ticks() */
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void cpu_enable_ticks(void) |
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{ |
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if (!timers_state.cpu_ticks_enabled) {
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timers_state.cpu_ticks_offset -= cpu_get_real_ticks(); |
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timers_state.cpu_clock_offset -= get_clock(); |
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timers_state.cpu_ticks_enabled = 1;
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} |
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} |
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/* disable cpu_get_ticks() : the clock is stopped. You must not call
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cpu_get_ticks() after that. */
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void cpu_disable_ticks(void) |
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{ |
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if (timers_state.cpu_ticks_enabled) {
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timers_state.cpu_ticks_offset = cpu_get_ticks(); |
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timers_state.cpu_clock_offset = cpu_get_clock(); |
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timers_state.cpu_ticks_enabled = 0;
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} |
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} |
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/***********************************************************/
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/* timers */
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#define QEMU_CLOCK_REALTIME 0 |
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#define QEMU_CLOCK_VIRTUAL 1 |
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#define QEMU_CLOCK_HOST 2 |
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struct QEMUClock {
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int type;
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int enabled;
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QEMUTimer *warp_timer; |
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}; |
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struct QEMUTimer {
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QEMUClock *clock; |
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int64_t expire_time; /* in nanoseconds */
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int scale;
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QEMUTimerCB *cb; |
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void *opaque;
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struct QEMUTimer *next;
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}; |
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struct qemu_alarm_timer {
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char const *name; |
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int (*start)(struct qemu_alarm_timer *t); |
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void (*stop)(struct qemu_alarm_timer *t); |
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void (*rearm)(struct qemu_alarm_timer *t); |
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#if defined(__linux__)
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int fd;
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timer_t timer; |
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#elif defined(_WIN32)
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HANDLE timer; |
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#endif
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char expired;
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char pending;
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}; |
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static struct qemu_alarm_timer *alarm_timer; |
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static bool qemu_timer_expired_ns(QEMUTimer *timer_head, int64_t current_time) |
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{ |
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return timer_head && (timer_head->expire_time <= current_time);
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} |
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int qemu_alarm_pending(void) |
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{ |
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return alarm_timer->pending;
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} |
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static inline int alarm_has_dynticks(struct qemu_alarm_timer *t) |
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{ |
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return !!t->rearm;
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} |
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static void qemu_rearm_alarm_timer(struct qemu_alarm_timer *t) |
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{ |
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if (!alarm_has_dynticks(t))
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return;
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t->rearm(t); |
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} |
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/* TODO: MIN_TIMER_REARM_NS should be optimized */
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#define MIN_TIMER_REARM_NS 250000 |
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#ifdef _WIN32
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static int mm_start_timer(struct qemu_alarm_timer *t); |
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static void mm_stop_timer(struct qemu_alarm_timer *t); |
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static void mm_rearm_timer(struct qemu_alarm_timer *t); |
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static int win32_start_timer(struct qemu_alarm_timer *t); |
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static void win32_stop_timer(struct qemu_alarm_timer *t); |
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static void win32_rearm_timer(struct qemu_alarm_timer *t); |
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#else
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static int unix_start_timer(struct qemu_alarm_timer *t); |
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static void unix_stop_timer(struct qemu_alarm_timer *t); |
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#ifdef __linux__
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static int dynticks_start_timer(struct qemu_alarm_timer *t); |
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static void dynticks_stop_timer(struct qemu_alarm_timer *t); |
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static void dynticks_rearm_timer(struct qemu_alarm_timer *t); |
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#endif /* __linux__ */ |
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#endif /* _WIN32 */ |
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/* Correlation between real and virtual time is always going to be
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fairly approximate, so ignore small variation.
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When the guest is idle real and virtual time will be aligned in
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the IO wait loop. */
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#define ICOUNT_WOBBLE (get_ticks_per_sec() / 10) |
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static void icount_adjust(void) |
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{ |
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int64_t cur_time; |
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int64_t cur_icount; |
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int64_t delta; |
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static int64_t last_delta;
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/* If the VM is not running, then do nothing. */
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if (!vm_running)
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return;
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cur_time = cpu_get_clock(); |
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cur_icount = qemu_get_clock_ns(vm_clock); |
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delta = cur_icount - cur_time; |
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/* FIXME: This is a very crude algorithm, somewhat prone to oscillation. */
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if (delta > 0 |
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&& last_delta + ICOUNT_WOBBLE < delta * 2
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&& icount_time_shift > 0) {
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/* The guest is getting too far ahead. Slow time down. */
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icount_time_shift--; |
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} |
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if (delta < 0 |
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&& last_delta - ICOUNT_WOBBLE > delta * 2
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&& icount_time_shift < MAX_ICOUNT_SHIFT) { |
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/* The guest is getting too far behind. Speed time up. */
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icount_time_shift++; |
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} |
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last_delta = delta; |
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qemu_icount_bias = cur_icount - (qemu_icount << icount_time_shift); |
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} |
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static void icount_adjust_rt(void * opaque) |
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{ |
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qemu_mod_timer(icount_rt_timer, |
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qemu_get_clock_ms(rt_clock) + 1000);
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icount_adjust(); |
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} |
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static void icount_adjust_vm(void * opaque) |
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{ |
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qemu_mod_timer(icount_vm_timer, |
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qemu_get_clock_ns(vm_clock) + get_ticks_per_sec() / 10);
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icount_adjust(); |
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} |
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int64_t qemu_icount_round(int64_t count) |
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{ |
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return (count + (1 << icount_time_shift) - 1) >> icount_time_shift; |
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} |
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static struct qemu_alarm_timer alarm_timers[] = { |
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#ifndef _WIN32
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#ifdef __linux__
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{"dynticks", dynticks_start_timer,
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dynticks_stop_timer, dynticks_rearm_timer}, |
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#endif
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{"unix", unix_start_timer, unix_stop_timer, NULL}, |
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#else
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{"mmtimer", mm_start_timer, mm_stop_timer, NULL}, |
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{"mmtimer2", mm_start_timer, mm_stop_timer, mm_rearm_timer},
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{"dynticks", win32_start_timer, win32_stop_timer, win32_rearm_timer},
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{"win32", win32_start_timer, win32_stop_timer, NULL}, |
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#endif
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{NULL, }
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}; |
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static void show_available_alarms(void) |
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{ |
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int i;
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printf("Available alarm timers, in order of precedence:\n");
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for (i = 0; alarm_timers[i].name; i++) |
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printf("%s\n", alarm_timers[i].name);
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} |
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void configure_alarms(char const *opt) |
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{ |
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int i;
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int cur = 0; |
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int count = ARRAY_SIZE(alarm_timers) - 1; |
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char *arg;
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char *name;
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struct qemu_alarm_timer tmp;
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if (!strcmp(opt, "?")) { |
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show_available_alarms(); |
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exit(0);
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} |
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arg = qemu_strdup(opt); |
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/* Reorder the array */
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name = strtok(arg, ",");
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while (name) {
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for (i = 0; i < count && alarm_timers[i].name; i++) { |
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if (!strcmp(alarm_timers[i].name, name))
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break;
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} |
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if (i == count) {
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fprintf(stderr, "Unknown clock %s\n", name);
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goto next;
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} |
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if (i < cur)
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/* Ignore */
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goto next;
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/* Swap */
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tmp = alarm_timers[i]; |
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alarm_timers[i] = alarm_timers[cur]; |
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alarm_timers[cur] = tmp; |
349 |
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cur++; |
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next:
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name = strtok(NULL, ","); |
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} |
354 |
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qemu_free(arg); |
356 |
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if (cur) {
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/* Disable remaining timers */
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for (i = cur; i < count; i++)
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alarm_timers[i].name = NULL;
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} else {
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show_available_alarms(); |
363 |
exit(1);
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} |
365 |
} |
366 |
|
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#define QEMU_NUM_CLOCKS 3 |
368 |
|
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QEMUClock *rt_clock; |
370 |
QEMUClock *vm_clock; |
371 |
QEMUClock *host_clock; |
372 |
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static QEMUTimer *active_timers[QEMU_NUM_CLOCKS];
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|
375 |
static QEMUClock *qemu_new_clock(int type) |
376 |
{ |
377 |
QEMUClock *clock; |
378 |
clock = qemu_mallocz(sizeof(QEMUClock));
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379 |
clock->type = type; |
380 |
clock->enabled = 1;
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return clock;
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382 |
} |
383 |
|
384 |
void qemu_clock_enable(QEMUClock *clock, int enabled) |
385 |
{ |
386 |
clock->enabled = enabled; |
387 |
} |
388 |
|
389 |
static int64_t vm_clock_warp_start;
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|
391 |
static void icount_warp_rt(void *opaque) |
392 |
{ |
393 |
if (vm_clock_warp_start == -1) { |
394 |
return;
|
395 |
} |
396 |
|
397 |
if (vm_running) {
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398 |
int64_t clock = qemu_get_clock_ns(rt_clock); |
399 |
int64_t warp_delta = clock - vm_clock_warp_start; |
400 |
if (use_icount == 1) { |
401 |
qemu_icount_bias += warp_delta; |
402 |
} else {
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403 |
/*
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404 |
* In adaptive mode, do not let the vm_clock run too
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405 |
* far ahead of real time.
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406 |
*/
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407 |
int64_t cur_time = cpu_get_clock(); |
408 |
int64_t cur_icount = qemu_get_clock_ns(vm_clock); |
409 |
int64_t delta = cur_time - cur_icount; |
410 |
qemu_icount_bias += MIN(warp_delta, delta); |
411 |
} |
412 |
if (qemu_timer_expired(active_timers[QEMU_CLOCK_VIRTUAL],
|
413 |
qemu_get_clock_ns(vm_clock))) { |
414 |
qemu_notify_event(); |
415 |
} |
416 |
} |
417 |
vm_clock_warp_start = -1;
|
418 |
} |
419 |
|
420 |
void qemu_clock_warp(QEMUClock *clock)
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421 |
{ |
422 |
int64_t deadline; |
423 |
|
424 |
if (!clock->warp_timer) {
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425 |
return;
|
426 |
} |
427 |
|
428 |
/*
|
429 |
* There are too many global variables to make the "warp" behavior
|
430 |
* applicable to other clocks. But a clock argument removes the
|
431 |
* need for if statements all over the place.
|
432 |
*/
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433 |
assert(clock == vm_clock); |
434 |
|
435 |
/*
|
436 |
* If the CPUs have been sleeping, advance the vm_clock timer now. This
|
437 |
* ensures that the deadline for the timer is computed correctly below.
|
438 |
* This also makes sure that the insn counter is synchronized before the
|
439 |
* CPU starts running, in case the CPU is woken by an event other than
|
440 |
* the earliest vm_clock timer.
|
441 |
*/
|
442 |
icount_warp_rt(NULL);
|
443 |
if (!all_cpu_threads_idle() || !active_timers[clock->type]) {
|
444 |
qemu_del_timer(clock->warp_timer); |
445 |
return;
|
446 |
} |
447 |
|
448 |
vm_clock_warp_start = qemu_get_clock_ns(rt_clock); |
449 |
deadline = qemu_next_icount_deadline(); |
450 |
if (deadline > 0) { |
451 |
/*
|
452 |
* Ensure the vm_clock proceeds even when the virtual CPU goes to
|
453 |
* sleep. Otherwise, the CPU might be waiting for a future timer
|
454 |
* interrupt to wake it up, but the interrupt never comes because
|
455 |
* the vCPU isn't running any insns and thus doesn't advance the
|
456 |
* vm_clock.
|
457 |
*
|
458 |
* An extreme solution for this problem would be to never let VCPUs
|
459 |
* sleep in icount mode if there is a pending vm_clock timer; rather
|
460 |
* time could just advance to the next vm_clock event. Instead, we
|
461 |
* do stop VCPUs and only advance vm_clock after some "real" time,
|
462 |
* (related to the time left until the next event) has passed. This
|
463 |
* rt_clock timer will do this. This avoids that the warps are too
|
464 |
* visible externally---for example, you will not be sending network
|
465 |
* packets continously instead of every 100ms.
|
466 |
*/
|
467 |
qemu_mod_timer(clock->warp_timer, vm_clock_warp_start + deadline); |
468 |
} else {
|
469 |
qemu_notify_event(); |
470 |
} |
471 |
} |
472 |
|
473 |
QEMUTimer *qemu_new_timer(QEMUClock *clock, int scale,
|
474 |
QEMUTimerCB *cb, void *opaque)
|
475 |
{ |
476 |
QEMUTimer *ts; |
477 |
|
478 |
ts = qemu_mallocz(sizeof(QEMUTimer));
|
479 |
ts->clock = clock; |
480 |
ts->cb = cb; |
481 |
ts->opaque = opaque; |
482 |
ts->scale = scale; |
483 |
return ts;
|
484 |
} |
485 |
|
486 |
void qemu_free_timer(QEMUTimer *ts)
|
487 |
{ |
488 |
qemu_free(ts); |
489 |
} |
490 |
|
491 |
/* stop a timer, but do not dealloc it */
|
492 |
void qemu_del_timer(QEMUTimer *ts)
|
493 |
{ |
494 |
QEMUTimer **pt, *t; |
495 |
|
496 |
/* NOTE: this code must be signal safe because
|
497 |
qemu_timer_expired() can be called from a signal. */
|
498 |
pt = &active_timers[ts->clock->type]; |
499 |
for(;;) {
|
500 |
t = *pt; |
501 |
if (!t)
|
502 |
break;
|
503 |
if (t == ts) {
|
504 |
*pt = t->next; |
505 |
break;
|
506 |
} |
507 |
pt = &t->next; |
508 |
} |
509 |
} |
510 |
|
511 |
/* modify the current timer so that it will be fired when current_time
|
512 |
>= expire_time. The corresponding callback will be called. */
|
513 |
static void qemu_mod_timer_ns(QEMUTimer *ts, int64_t expire_time) |
514 |
{ |
515 |
QEMUTimer **pt, *t; |
516 |
|
517 |
qemu_del_timer(ts); |
518 |
|
519 |
/* add the timer in the sorted list */
|
520 |
/* NOTE: this code must be signal safe because
|
521 |
qemu_timer_expired() can be called from a signal. */
|
522 |
pt = &active_timers[ts->clock->type]; |
523 |
for(;;) {
|
524 |
t = *pt; |
525 |
if (!qemu_timer_expired_ns(t, expire_time)) {
|
526 |
break;
|
527 |
} |
528 |
pt = &t->next; |
529 |
} |
530 |
ts->expire_time = expire_time; |
531 |
ts->next = *pt; |
532 |
*pt = ts; |
533 |
|
534 |
/* Rearm if necessary */
|
535 |
if (pt == &active_timers[ts->clock->type]) {
|
536 |
if (!alarm_timer->pending) {
|
537 |
qemu_rearm_alarm_timer(alarm_timer); |
538 |
} |
539 |
/* Interrupt execution to force deadline recalculation. */
|
540 |
qemu_clock_warp(ts->clock); |
541 |
if (use_icount) {
|
542 |
qemu_notify_event(); |
543 |
} |
544 |
} |
545 |
} |
546 |
|
547 |
/* modify the current timer so that it will be fired when current_time
|
548 |
>= expire_time. The corresponding callback will be called. */
|
549 |
void qemu_mod_timer(QEMUTimer *ts, int64_t expire_time)
|
550 |
{ |
551 |
qemu_mod_timer_ns(ts, expire_time * ts->scale); |
552 |
} |
553 |
|
554 |
int qemu_timer_pending(QEMUTimer *ts)
|
555 |
{ |
556 |
QEMUTimer *t; |
557 |
for(t = active_timers[ts->clock->type]; t != NULL; t = t->next) { |
558 |
if (t == ts)
|
559 |
return 1; |
560 |
} |
561 |
return 0; |
562 |
} |
563 |
|
564 |
int qemu_timer_expired(QEMUTimer *timer_head, int64_t current_time)
|
565 |
{ |
566 |
return qemu_timer_expired_ns(timer_head, current_time * timer_head->scale);
|
567 |
} |
568 |
|
569 |
static void qemu_run_timers(QEMUClock *clock) |
570 |
{ |
571 |
QEMUTimer **ptimer_head, *ts; |
572 |
int64_t current_time; |
573 |
|
574 |
if (!clock->enabled)
|
575 |
return;
|
576 |
|
577 |
current_time = qemu_get_clock_ns(clock); |
578 |
ptimer_head = &active_timers[clock->type]; |
579 |
for(;;) {
|
580 |
ts = *ptimer_head; |
581 |
if (!qemu_timer_expired_ns(ts, current_time)) {
|
582 |
break;
|
583 |
} |
584 |
/* remove timer from the list before calling the callback */
|
585 |
*ptimer_head = ts->next; |
586 |
ts->next = NULL;
|
587 |
|
588 |
/* run the callback (the timer list can be modified) */
|
589 |
ts->cb(ts->opaque); |
590 |
} |
591 |
} |
592 |
|
593 |
int64_t qemu_get_clock_ns(QEMUClock *clock) |
594 |
{ |
595 |
switch(clock->type) {
|
596 |
case QEMU_CLOCK_REALTIME:
|
597 |
return get_clock();
|
598 |
default:
|
599 |
case QEMU_CLOCK_VIRTUAL:
|
600 |
if (use_icount) {
|
601 |
return cpu_get_icount();
|
602 |
} else {
|
603 |
return cpu_get_clock();
|
604 |
} |
605 |
case QEMU_CLOCK_HOST:
|
606 |
return get_clock_realtime();
|
607 |
} |
608 |
} |
609 |
|
610 |
void init_clocks(void) |
611 |
{ |
612 |
rt_clock = qemu_new_clock(QEMU_CLOCK_REALTIME); |
613 |
vm_clock = qemu_new_clock(QEMU_CLOCK_VIRTUAL); |
614 |
host_clock = qemu_new_clock(QEMU_CLOCK_HOST); |
615 |
|
616 |
rtc_clock = host_clock; |
617 |
} |
618 |
|
619 |
/* save a timer */
|
620 |
void qemu_put_timer(QEMUFile *f, QEMUTimer *ts)
|
621 |
{ |
622 |
uint64_t expire_time; |
623 |
|
624 |
if (qemu_timer_pending(ts)) {
|
625 |
expire_time = ts->expire_time; |
626 |
} else {
|
627 |
expire_time = -1;
|
628 |
} |
629 |
qemu_put_be64(f, expire_time); |
630 |
} |
631 |
|
632 |
void qemu_get_timer(QEMUFile *f, QEMUTimer *ts)
|
633 |
{ |
634 |
uint64_t expire_time; |
635 |
|
636 |
expire_time = qemu_get_be64(f); |
637 |
if (expire_time != -1) { |
638 |
qemu_mod_timer_ns(ts, expire_time); |
639 |
} else {
|
640 |
qemu_del_timer(ts); |
641 |
} |
642 |
} |
643 |
|
644 |
static const VMStateDescription vmstate_timers = { |
645 |
.name = "timer",
|
646 |
.version_id = 2,
|
647 |
.minimum_version_id = 1,
|
648 |
.minimum_version_id_old = 1,
|
649 |
.fields = (VMStateField []) { |
650 |
VMSTATE_INT64(cpu_ticks_offset, TimersState), |
651 |
VMSTATE_INT64(dummy, TimersState), |
652 |
VMSTATE_INT64_V(cpu_clock_offset, TimersState, 2),
|
653 |
VMSTATE_END_OF_LIST() |
654 |
} |
655 |
}; |
656 |
|
657 |
void configure_icount(const char *option) |
658 |
{ |
659 |
vmstate_register(NULL, 0, &vmstate_timers, &timers_state); |
660 |
if (!option)
|
661 |
return;
|
662 |
|
663 |
#ifdef CONFIG_IOTHREAD
|
664 |
vm_clock->warp_timer = qemu_new_timer_ns(rt_clock, icount_warp_rt, NULL);
|
665 |
#endif
|
666 |
|
667 |
if (strcmp(option, "auto") != 0) { |
668 |
icount_time_shift = strtol(option, NULL, 0); |
669 |
use_icount = 1;
|
670 |
return;
|
671 |
} |
672 |
|
673 |
use_icount = 2;
|
674 |
|
675 |
/* 125MIPS seems a reasonable initial guess at the guest speed.
|
676 |
It will be corrected fairly quickly anyway. */
|
677 |
icount_time_shift = 3;
|
678 |
|
679 |
/* Have both realtime and virtual time triggers for speed adjustment.
|
680 |
The realtime trigger catches emulated time passing too slowly,
|
681 |
the virtual time trigger catches emulated time passing too fast.
|
682 |
Realtime triggers occur even when idle, so use them less frequently
|
683 |
than VM triggers. */
|
684 |
icount_rt_timer = qemu_new_timer_ms(rt_clock, icount_adjust_rt, NULL);
|
685 |
qemu_mod_timer(icount_rt_timer, |
686 |
qemu_get_clock_ms(rt_clock) + 1000);
|
687 |
icount_vm_timer = qemu_new_timer_ns(vm_clock, icount_adjust_vm, NULL);
|
688 |
qemu_mod_timer(icount_vm_timer, |
689 |
qemu_get_clock_ns(vm_clock) + get_ticks_per_sec() / 10);
|
690 |
} |
691 |
|
692 |
void qemu_run_all_timers(void) |
693 |
{ |
694 |
alarm_timer->pending = 0;
|
695 |
|
696 |
/* rearm timer, if not periodic */
|
697 |
if (alarm_timer->expired) {
|
698 |
alarm_timer->expired = 0;
|
699 |
qemu_rearm_alarm_timer(alarm_timer); |
700 |
} |
701 |
|
702 |
/* vm time timers */
|
703 |
if (vm_running) {
|
704 |
qemu_run_timers(vm_clock); |
705 |
} |
706 |
|
707 |
qemu_run_timers(rt_clock); |
708 |
qemu_run_timers(host_clock); |
709 |
} |
710 |
|
711 |
static int64_t qemu_next_alarm_deadline(void); |
712 |
|
713 |
#ifdef _WIN32
|
714 |
static void CALLBACK host_alarm_handler(PVOID lpParam, BOOLEAN unused) |
715 |
#else
|
716 |
static void host_alarm_handler(int host_signum) |
717 |
#endif
|
718 |
{ |
719 |
struct qemu_alarm_timer *t = alarm_timer;
|
720 |
if (!t)
|
721 |
return;
|
722 |
|
723 |
#if 0
|
724 |
#define DISP_FREQ 1000
|
725 |
{
|
726 |
static int64_t delta_min = INT64_MAX;
|
727 |
static int64_t delta_max, delta_cum, last_clock, delta, ti;
|
728 |
static int count;
|
729 |
ti = qemu_get_clock_ns(vm_clock);
|
730 |
if (last_clock != 0) {
|
731 |
delta = ti - last_clock;
|
732 |
if (delta < delta_min)
|
733 |
delta_min = delta;
|
734 |
if (delta > delta_max)
|
735 |
delta_max = delta;
|
736 |
delta_cum += delta;
|
737 |
if (++count == DISP_FREQ) {
|
738 |
printf("timer: min=%" PRId64 " us max=%" PRId64 " us avg=%" PRId64 " us avg_freq=%0.3f Hz\n",
|
739 |
muldiv64(delta_min, 1000000, get_ticks_per_sec()),
|
740 |
muldiv64(delta_max, 1000000, get_ticks_per_sec()),
|
741 |
muldiv64(delta_cum, 1000000 / DISP_FREQ, get_ticks_per_sec()),
|
742 |
(double)get_ticks_per_sec() / ((double)delta_cum / DISP_FREQ));
|
743 |
count = 0;
|
744 |
delta_min = INT64_MAX;
|
745 |
delta_max = 0;
|
746 |
delta_cum = 0;
|
747 |
}
|
748 |
}
|
749 |
last_clock = ti;
|
750 |
}
|
751 |
#endif
|
752 |
if (alarm_has_dynticks(t) ||
|
753 |
qemu_next_alarm_deadline () <= 0) {
|
754 |
t->expired = alarm_has_dynticks(t); |
755 |
t->pending = 1;
|
756 |
qemu_notify_event(); |
757 |
} |
758 |
} |
759 |
|
760 |
int64_t qemu_next_icount_deadline(void)
|
761 |
{ |
762 |
/* To avoid problems with overflow limit this to 2^32. */
|
763 |
int64_t delta = INT32_MAX; |
764 |
|
765 |
assert(use_icount); |
766 |
if (active_timers[QEMU_CLOCK_VIRTUAL]) {
|
767 |
delta = active_timers[QEMU_CLOCK_VIRTUAL]->expire_time - |
768 |
qemu_get_clock_ns(vm_clock); |
769 |
} |
770 |
|
771 |
if (delta < 0) |
772 |
delta = 0;
|
773 |
|
774 |
return delta;
|
775 |
} |
776 |
|
777 |
static int64_t qemu_next_alarm_deadline(void) |
778 |
{ |
779 |
int64_t delta; |
780 |
int64_t rtdelta; |
781 |
|
782 |
if (!use_icount && active_timers[QEMU_CLOCK_VIRTUAL]) {
|
783 |
delta = active_timers[QEMU_CLOCK_VIRTUAL]->expire_time - |
784 |
qemu_get_clock_ns(vm_clock); |
785 |
} else {
|
786 |
delta = INT32_MAX; |
787 |
} |
788 |
if (active_timers[QEMU_CLOCK_HOST]) {
|
789 |
int64_t hdelta = active_timers[QEMU_CLOCK_HOST]->expire_time - |
790 |
qemu_get_clock_ns(host_clock); |
791 |
if (hdelta < delta)
|
792 |
delta = hdelta; |
793 |
} |
794 |
if (active_timers[QEMU_CLOCK_REALTIME]) {
|
795 |
rtdelta = (active_timers[QEMU_CLOCK_REALTIME]->expire_time - |
796 |
qemu_get_clock_ns(rt_clock)); |
797 |
if (rtdelta < delta)
|
798 |
delta = rtdelta; |
799 |
} |
800 |
|
801 |
return delta;
|
802 |
} |
803 |
|
804 |
#if defined(__linux__)
|
805 |
|
806 |
static int dynticks_start_timer(struct qemu_alarm_timer *t) |
807 |
{ |
808 |
struct sigevent ev;
|
809 |
timer_t host_timer; |
810 |
struct sigaction act;
|
811 |
|
812 |
sigfillset(&act.sa_mask); |
813 |
act.sa_flags = 0;
|
814 |
act.sa_handler = host_alarm_handler; |
815 |
|
816 |
sigaction(SIGALRM, &act, NULL);
|
817 |
|
818 |
/*
|
819 |
* Initialize ev struct to 0 to avoid valgrind complaining
|
820 |
* about uninitialized data in timer_create call
|
821 |
*/
|
822 |
memset(&ev, 0, sizeof(ev)); |
823 |
ev.sigev_value.sival_int = 0;
|
824 |
ev.sigev_notify = SIGEV_SIGNAL; |
825 |
ev.sigev_signo = SIGALRM; |
826 |
|
827 |
if (timer_create(CLOCK_REALTIME, &ev, &host_timer)) {
|
828 |
perror("timer_create");
|
829 |
|
830 |
/* disable dynticks */
|
831 |
fprintf(stderr, "Dynamic Ticks disabled\n");
|
832 |
|
833 |
return -1; |
834 |
} |
835 |
|
836 |
t->timer = host_timer; |
837 |
|
838 |
return 0; |
839 |
} |
840 |
|
841 |
static void dynticks_stop_timer(struct qemu_alarm_timer *t) |
842 |
{ |
843 |
timer_t host_timer = t->timer; |
844 |
|
845 |
timer_delete(host_timer); |
846 |
} |
847 |
|
848 |
static void dynticks_rearm_timer(struct qemu_alarm_timer *t) |
849 |
{ |
850 |
timer_t host_timer = t->timer; |
851 |
struct itimerspec timeout;
|
852 |
int64_t nearest_delta_ns = INT64_MAX; |
853 |
int64_t current_ns; |
854 |
|
855 |
assert(alarm_has_dynticks(t)); |
856 |
if (!active_timers[QEMU_CLOCK_REALTIME] &&
|
857 |
!active_timers[QEMU_CLOCK_VIRTUAL] && |
858 |
!active_timers[QEMU_CLOCK_HOST]) |
859 |
return;
|
860 |
|
861 |
nearest_delta_ns = qemu_next_alarm_deadline(); |
862 |
if (nearest_delta_ns < MIN_TIMER_REARM_NS)
|
863 |
nearest_delta_ns = MIN_TIMER_REARM_NS; |
864 |
|
865 |
/* check whether a timer is already running */
|
866 |
if (timer_gettime(host_timer, &timeout)) {
|
867 |
perror("gettime");
|
868 |
fprintf(stderr, "Internal timer error: aborting\n");
|
869 |
exit(1);
|
870 |
} |
871 |
current_ns = timeout.it_value.tv_sec * 1000000000LL + timeout.it_value.tv_nsec;
|
872 |
if (current_ns && current_ns <= nearest_delta_ns)
|
873 |
return;
|
874 |
|
875 |
timeout.it_interval.tv_sec = 0;
|
876 |
timeout.it_interval.tv_nsec = 0; /* 0 for one-shot timer */ |
877 |
timeout.it_value.tv_sec = nearest_delta_ns / 1000000000;
|
878 |
timeout.it_value.tv_nsec = nearest_delta_ns % 1000000000;
|
879 |
if (timer_settime(host_timer, 0 /* RELATIVE */, &timeout, NULL)) { |
880 |
perror("settime");
|
881 |
fprintf(stderr, "Internal timer error: aborting\n");
|
882 |
exit(1);
|
883 |
} |
884 |
} |
885 |
|
886 |
#endif /* defined(__linux__) */ |
887 |
|
888 |
#if !defined(_WIN32)
|
889 |
|
890 |
static int unix_start_timer(struct qemu_alarm_timer *t) |
891 |
{ |
892 |
struct sigaction act;
|
893 |
struct itimerval itv;
|
894 |
int err;
|
895 |
|
896 |
/* timer signal */
|
897 |
sigfillset(&act.sa_mask); |
898 |
act.sa_flags = 0;
|
899 |
act.sa_handler = host_alarm_handler; |
900 |
|
901 |
sigaction(SIGALRM, &act, NULL);
|
902 |
|
903 |
itv.it_interval.tv_sec = 0;
|
904 |
/* for i386 kernel 2.6 to get 1 ms */
|
905 |
itv.it_interval.tv_usec = 999;
|
906 |
itv.it_value.tv_sec = 0;
|
907 |
itv.it_value.tv_usec = 10 * 1000; |
908 |
|
909 |
err = setitimer(ITIMER_REAL, &itv, NULL);
|
910 |
if (err)
|
911 |
return -1; |
912 |
|
913 |
return 0; |
914 |
} |
915 |
|
916 |
static void unix_stop_timer(struct qemu_alarm_timer *t) |
917 |
{ |
918 |
struct itimerval itv;
|
919 |
|
920 |
memset(&itv, 0, sizeof(itv)); |
921 |
setitimer(ITIMER_REAL, &itv, NULL);
|
922 |
} |
923 |
|
924 |
#endif /* !defined(_WIN32) */ |
925 |
|
926 |
|
927 |
#ifdef _WIN32
|
928 |
|
929 |
static MMRESULT mm_timer;
|
930 |
static unsigned mm_period; |
931 |
|
932 |
static void CALLBACK mm_alarm_handler(UINT uTimerID, UINT uMsg, |
933 |
DWORD_PTR dwUser, DWORD_PTR dw1, |
934 |
DWORD_PTR dw2) |
935 |
{ |
936 |
struct qemu_alarm_timer *t = alarm_timer;
|
937 |
if (!t) {
|
938 |
return;
|
939 |
} |
940 |
if (alarm_has_dynticks(t) || qemu_next_alarm_deadline() <= 0) { |
941 |
t->expired = alarm_has_dynticks(t); |
942 |
t->pending = 1;
|
943 |
qemu_notify_event(); |
944 |
} |
945 |
} |
946 |
|
947 |
static int mm_start_timer(struct qemu_alarm_timer *t) |
948 |
{ |
949 |
TIMECAPS tc; |
950 |
UINT flags; |
951 |
|
952 |
memset(&tc, 0, sizeof(tc)); |
953 |
timeGetDevCaps(&tc, sizeof(tc));
|
954 |
|
955 |
mm_period = tc.wPeriodMin; |
956 |
timeBeginPeriod(mm_period); |
957 |
|
958 |
flags = TIME_CALLBACK_FUNCTION; |
959 |
if (alarm_has_dynticks(t)) {
|
960 |
flags |= TIME_ONESHOT; |
961 |
} else {
|
962 |
flags |= TIME_PERIODIC; |
963 |
} |
964 |
|
965 |
mm_timer = timeSetEvent(1, /* interval (ms) */ |
966 |
mm_period, /* resolution */
|
967 |
mm_alarm_handler, /* function */
|
968 |
(DWORD_PTR)t, /* parameter */
|
969 |
flags); |
970 |
|
971 |
if (!mm_timer) {
|
972 |
fprintf(stderr, "Failed to initialize win32 alarm timer: %ld\n",
|
973 |
GetLastError()); |
974 |
timeEndPeriod(mm_period); |
975 |
return -1; |
976 |
} |
977 |
|
978 |
return 0; |
979 |
} |
980 |
|
981 |
static void mm_stop_timer(struct qemu_alarm_timer *t) |
982 |
{ |
983 |
timeKillEvent(mm_timer); |
984 |
timeEndPeriod(mm_period); |
985 |
} |
986 |
|
987 |
static void mm_rearm_timer(struct qemu_alarm_timer *t) |
988 |
{ |
989 |
int nearest_delta_ms;
|
990 |
|
991 |
assert(alarm_has_dynticks(t)); |
992 |
if (!active_timers[QEMU_CLOCK_REALTIME] &&
|
993 |
!active_timers[QEMU_CLOCK_VIRTUAL] && |
994 |
!active_timers[QEMU_CLOCK_HOST]) { |
995 |
return;
|
996 |
} |
997 |
|
998 |
timeKillEvent(mm_timer); |
999 |
|
1000 |
nearest_delta_ms = (qemu_next_alarm_deadline() + 999999) / 1000000; |
1001 |
if (nearest_delta_ms < 1) { |
1002 |
nearest_delta_ms = 1;
|
1003 |
} |
1004 |
mm_timer = timeSetEvent(nearest_delta_ms, |
1005 |
mm_period, |
1006 |
mm_alarm_handler, |
1007 |
(DWORD_PTR)t, |
1008 |
TIME_ONESHOT | TIME_CALLBACK_FUNCTION); |
1009 |
|
1010 |
if (!mm_timer) {
|
1011 |
fprintf(stderr, "Failed to re-arm win32 alarm timer %ld\n",
|
1012 |
GetLastError()); |
1013 |
|
1014 |
timeEndPeriod(mm_period); |
1015 |
exit(1);
|
1016 |
} |
1017 |
} |
1018 |
|
1019 |
static int win32_start_timer(struct qemu_alarm_timer *t) |
1020 |
{ |
1021 |
HANDLE hTimer; |
1022 |
BOOLEAN success; |
1023 |
|
1024 |
/* If you call ChangeTimerQueueTimer on a one-shot timer (its period
|
1025 |
is zero) that has already expired, the timer is not updated. Since
|
1026 |
creating a new timer is relatively expensive, set a bogus one-hour
|
1027 |
interval in the dynticks case. */
|
1028 |
success = CreateTimerQueueTimer(&hTimer, |
1029 |
NULL,
|
1030 |
host_alarm_handler, |
1031 |
t, |
1032 |
1,
|
1033 |
alarm_has_dynticks(t) ? 3600000 : 1, |
1034 |
WT_EXECUTEINTIMERTHREAD); |
1035 |
|
1036 |
if (!success) {
|
1037 |
fprintf(stderr, "Failed to initialize win32 alarm timer: %ld\n",
|
1038 |
GetLastError()); |
1039 |
return -1; |
1040 |
} |
1041 |
|
1042 |
t->timer = hTimer; |
1043 |
return 0; |
1044 |
} |
1045 |
|
1046 |
static void win32_stop_timer(struct qemu_alarm_timer *t) |
1047 |
{ |
1048 |
HANDLE hTimer = t->timer; |
1049 |
|
1050 |
if (hTimer) {
|
1051 |
DeleteTimerQueueTimer(NULL, hTimer, NULL); |
1052 |
} |
1053 |
} |
1054 |
|
1055 |
static void win32_rearm_timer(struct qemu_alarm_timer *t) |
1056 |
{ |
1057 |
HANDLE hTimer = t->timer; |
1058 |
int nearest_delta_ms;
|
1059 |
BOOLEAN success; |
1060 |
|
1061 |
assert(alarm_has_dynticks(t)); |
1062 |
if (!active_timers[QEMU_CLOCK_REALTIME] &&
|
1063 |
!active_timers[QEMU_CLOCK_VIRTUAL] && |
1064 |
!active_timers[QEMU_CLOCK_HOST]) |
1065 |
return;
|
1066 |
|
1067 |
nearest_delta_ms = (qemu_next_alarm_deadline() + 999999) / 1000000; |
1068 |
if (nearest_delta_ms < 1) { |
1069 |
nearest_delta_ms = 1;
|
1070 |
} |
1071 |
success = ChangeTimerQueueTimer(NULL,
|
1072 |
hTimer, |
1073 |
nearest_delta_ms, |
1074 |
3600000);
|
1075 |
|
1076 |
if (!success) {
|
1077 |
fprintf(stderr, "Failed to rearm win32 alarm timer: %ld\n",
|
1078 |
GetLastError()); |
1079 |
exit(-1);
|
1080 |
} |
1081 |
|
1082 |
} |
1083 |
|
1084 |
#endif /* _WIN32 */ |
1085 |
|
1086 |
static void alarm_timer_on_change_state_rearm(void *opaque, int running, int reason) |
1087 |
{ |
1088 |
if (running)
|
1089 |
qemu_rearm_alarm_timer((struct qemu_alarm_timer *) opaque);
|
1090 |
} |
1091 |
|
1092 |
int init_timer_alarm(void) |
1093 |
{ |
1094 |
struct qemu_alarm_timer *t = NULL; |
1095 |
int i, err = -1; |
1096 |
|
1097 |
for (i = 0; alarm_timers[i].name; i++) { |
1098 |
t = &alarm_timers[i]; |
1099 |
|
1100 |
err = t->start(t); |
1101 |
if (!err)
|
1102 |
break;
|
1103 |
} |
1104 |
|
1105 |
if (err) {
|
1106 |
err = -ENOENT; |
1107 |
goto fail;
|
1108 |
} |
1109 |
|
1110 |
/* first event is at time 0 */
|
1111 |
t->pending = 1;
|
1112 |
alarm_timer = t; |
1113 |
qemu_add_vm_change_state_handler(alarm_timer_on_change_state_rearm, t); |
1114 |
|
1115 |
return 0; |
1116 |
|
1117 |
fail:
|
1118 |
return err;
|
1119 |
} |
1120 |
|
1121 |
void quit_timers(void) |
1122 |
{ |
1123 |
struct qemu_alarm_timer *t = alarm_timer;
|
1124 |
alarm_timer = NULL;
|
1125 |
t->stop(t); |
1126 |
} |
1127 |
|
1128 |
int qemu_calculate_timeout(void) |
1129 |
{ |
1130 |
#ifndef CONFIG_IOTHREAD
|
1131 |
int timeout;
|
1132 |
|
1133 |
if (!vm_running)
|
1134 |
timeout = 5000;
|
1135 |
else {
|
1136 |
/* XXX: use timeout computed from timers */
|
1137 |
int64_t add; |
1138 |
int64_t delta; |
1139 |
/* Advance virtual time to the next event. */
|
1140 |
delta = qemu_icount_delta(); |
1141 |
if (delta > 0) { |
1142 |
/* If virtual time is ahead of real time then just
|
1143 |
wait for IO. */
|
1144 |
timeout = (delta + 999999) / 1000000; |
1145 |
} else {
|
1146 |
/* Wait for either IO to occur or the next
|
1147 |
timer event. */
|
1148 |
add = qemu_next_icount_deadline(); |
1149 |
/* We advance the timer before checking for IO.
|
1150 |
Limit the amount we advance so that early IO
|
1151 |
activity won't get the guest too far ahead. */
|
1152 |
if (add > 10000000) |
1153 |
add = 10000000;
|
1154 |
delta += add; |
1155 |
qemu_icount += qemu_icount_round (add); |
1156 |
timeout = delta / 1000000;
|
1157 |
if (timeout < 0) |
1158 |
timeout = 0;
|
1159 |
} |
1160 |
} |
1161 |
|
1162 |
return timeout;
|
1163 |
#else /* CONFIG_IOTHREAD */ |
1164 |
return 1000; |
1165 |
#endif
|
1166 |
} |
1167 |
|